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Detailed Program
Paper Number : AD-P01
Time Frame : 12:00~13:30
Presentation Date : Thursday, 27, November
Session Name : Advanced Coating for Gas Turbines
Session Chair 1# : -
Session Chair 2# : -
Relation between Na2SiF6 Concentration and Mechanical Properties of AZ31 Magnesium Alloy coated by Electrolytic Plasma Processing
Mr. Yeong seung Jeong
Changwon National University
Electrolytic Plasma Processing (EPP) is an electro chemical and physical surface treatment process for generating oxide coatings on metals. It is used to grow thick and dense ceramic oxide coatings on metals such as aluminum, magnesium and titanium. Earlier researches showed that the EPP ceramic coatings could offer attractive combination properties of wear resistance, corrosion resistance, mechanical strength, interfacial adhesion, thermal resistance and so on. According to these researches, coating performances are determined by such complex EPP experimental parameters as substrate material, electrolyte composition, applied voltage, current, frequency, process time, and so on.[1,2] The effect of Na2SiF6 concentration on the ceramic oxide coatings prepared on AZ31 magnesium alloy through electrolytic plasma processing in a Na2SiO3 -NaOH electrolytic solution, have been investigated. The x-ray diffraction (XRD) results show that the coating formed in silicate electrolyte is mainly composed of MgO, Mg2SiO4. Scanning electron microscopy (SEM) micrographs reveals that the number of pores on coating surface decreases by increasing concentration of Na2SiF6 and all coatings have similar surface morphologies. The observed micro-hardness of coating layers is over 1000 Hv, which is much higher than that of the uncoated AZ31 magnesium alloy. The wear-loss of the coatings formed in electrolyte of 0.3 g/L Na2SiF6 shows better properties than the other two electrolytes. Because the coated specimen (in 0.3 g/L Na2SiF6) has the higher density, than the coatings formed with the other electrolytes.
Acknowledgements : This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIP) (No.2011-0030058). This research was financially supported by the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea(NRF) through the Human Resource Training Project for Regional Innovation (2012H1B8A2026212)